Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Silicone contamination

Silicone contamination

Silicone contamination

Anyone familiar with the control/monitoring of facilites for contamination by silicones (broad term I know, sorry)ESPECIALLY in areas where critical bonding operations take place?  Any relevant standards (IEST, Mil etc.)?

RE: Silicone contamination

Couple of things :

1. Silicone (uncured) present on the surfaces to be bonded is the real problem. Zero contamination is impossible and  any silicone present on the bonding surface adds to the knock down factor.

2. If you are looking to quantify, monitor the amount of silicone cntamination on the bonding surfaces: then XPS is good reliable but expensive method. There is also a new method that has shown up in recent years, using uv light and reflection data. (www.photoemission.com)

Last but not the least, if your bonding substrate surface is composite, then silicone contamination is really bad and reduces the shear strength of the bond. The failure modes are different. Surface preperation by bead blasting does help, however the residual uncured silicone molecules add to the knock down factor.

I hope this helps.



RE: Silicone contamination

Thanks AK, will check out the site.  We have used Digesil and plasma etching as surface preps here.  A verification of the surfaces for "acceptable" levels of conyamination after treatment by one of the methods you mention would be helpful in qualifying our critical bonds.


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close